How to Attach a Ledger Board for a Deck Guide for Eastern Washington Homeowners & Contractors
Why the Ledger Board Is the Most Important Connection on Your Deck
If you’re building a deck anywhere from Airway Heights to Colville to Kettle Falls, the ledger board is the single connection point that matters most. It’s the piece that bolts your deck frame to your house, and it carries a huge share of the deck’s total load — often close to half the weight of the entire structure. Get it wrong, and you’re not looking at a squeaky board or a loose railing. You’re looking at a deck that can pull away from the house, sometimes catastrophically, sometimes slowly through hidden water damage that you won’t notice until siding comes off for another project.
We’ve been serving builders and homeowners across Eastern Washington since 1979, and ledger board questions are some of the most common ones we field at the counter in Airway Heights, Colville, and Kettle Falls. The good news: the rules are well established, the materials are available, and most mistakes are entirely avoidable once you understand the core principles.
The Core Rule: Structural Framing, Not Siding
A ledger board has to be lag-bolted or through-bolted into the house’s structural framing — typically the rim joist or band joist — not just screwed into siding, sheathing, or wall studs. Studs run vertically and aren’t designed to carry the kind of lateral and downward load a deck ledger transfers. Siding and sheathing are even worse attachment points; they’re not structural at all. This means that in almost every ledger installation, you’re removing a strip of siding first so you can see and fasten directly into that rim joist.
Locating and Preparing the Attachment Point
Before you pick up a drill, you need to know exactly where your rim joist is. On most platform-framed homes common throughout the Spokane area and North Idaho border region, the rim joist sits at the floor line, usually visible from the basement or crawlspace if you have interior access. If you don’t have interior access — common in additions, finished basements, or slab-on-grade sections — you’ll need to locate it from the exterior by measuring down from a known floor line or by careful exploratory removal of siding.
Removing Siding the Right Way
Plan to remove enough siding to expose the full width of the ledger board plus a few extra inches on each side and above for flashing integration. Cutting back lap siding or panel siding cleanly, rather than just notching around the ledger, gives you room to properly tie your flashing into the existing weather-resistive barrier. This is not a step to shortcut. A ledger that’s technically bolted correctly but poorly flashed will still let water into the wall assembly, and in our climate that moisture doesn’t dry out quickly.
Checking for Hidden Rot
Once the siding is off, inspect the rim joist and sheathing carefully. Older homes throughout Stevens County and the Colville Valley — especially ones that have had multiple re-siding jobs over the decades — sometimes hide rot, old fastener holes, or water staining behind the cladding. If the rim joist is soft, delaminating, or shows active decay, stop and address that repair before attaching anything. A ledger is only as strong as what it’s bolted to.
Flashing: The Step Eastern Washington Homeowners Can’t Afford to Skip
Our region swings hard between seasons — dry, hot summers followed by wet falls, heavy snow loads in Colville and Kettle Falls, and freeze-thaw cycles that repeat over and over through the winter. That freeze-thaw action is exactly why flashing mistakes turn into big problems. Water that gets behind an unflashed or poorly flashed ledger will freeze, expand, and widen the gap it came through. What starts as a pinhole leak in October can be a rot pocket by March.
The Correct Flashing Sequence
Install a self-adhered flashing membrane directly against the exposed sheathing before the ledger goes up, lapping it correctly with the existing house wrap so water sheds outward, not inward. The ledger board gets installed over this membrane. Above the ledger, install a metal or PVC flashing that kicks water away from the top edge of the ledger and out from the wall. Siding then gets reinstalled over the top flashing leg, completing the water path so everything drains down and away rather than pooling at the ledger connection.
Don’t Forget a Gap Behind the Ledger
Many installers leave a small consistent gap — often created with washers or specific structural screws designed for this purpose — between the back of the ledger and the wall sheathing. This lets any moisture that does get behind the board drain and dry rather than sitting trapped against wet wood. In a climate with our humidity swings and cold snaps, that airflow gap can be the difference between a deck ledger that lasts twenty years and one that needs replacement in five.
Fasteners: What Actually Meets Code
This is where we see the most DIY mistakes at our stores. Regular framing nails, standard deck screws, and drywall screws are not acceptable for ledger attachment, full stop. They don’t have the shear and withdrawal strength to handle deck loads, and they will not pass inspection.
Approved Fastener Options
You have a few code-compliant paths:
- Through-bolts (typically 1/2-inch diameter carriage bolts or hex bolts with washers and nuts) that pass completely through the ledger, the wall sheathing, and the rim joist, secured with a washer and nut on the interior side. These are often the strongest and most inspector-friendly option when you have interior access.
- Lag screws rated for structural ledger use, sized and spaced according to your local building department’s span tables.
- Structural ledger screws designed specifically for this application — Simpson Strong-Tie’s SDWS structural screw, GRK’s RSS screw, and FastenMaster’s LedgerLOK are all commonly specified products that don’t require pre-drilling in the same way lag bolts do and are engineered for exactly this connection.
Whichever fastener you choose, make sure it’s rated for exterior, structural use with pressure-treated lumber. Modern pressure treatment chemicals are corrosive to standard steel, so fasteners need to carry the appropriate coating or be stainless or hot-dip galvanized.
Fastener Spacing
Spacing depends on the fastener type, the ledger board size, and the load the deck will carry, but most code tables put structural fasteners somewhere in the 16- to 30-inch on-center range, staggered in two rows — one near the top of the ledger, one near the bottom — rather than a single centered row. Staggering rows also helps prevent splitting along the same grain line. Always check the specific span and spacing table for the fastener brand and size you’re using; manufacturers publish these because generic “close enough” spacing is one of the most common reasons ledger installations fail inspection.
Special Considerations for Eastern Washington Homes
Every region has its own quirks, and ours are shaped by climate, home age, and terrain.
Snow Load and Second-Story Decks
Areas around Colville and Kettle Falls regularly see heavier snow accumulation than the Spokane valley floor. If you’re building a second-story deck or one that will bear snow load through the winter months rather than being shoveled off promptly, make sure your ledger fastening schedule and joist hanger selection account for that additional dead and live load. This is a case where it’s worth having a local building department or engineer confirm your span and fastener spec rather than eyeballing it from a generic table.
Older Homes and Mixed Siding Layers
A lot of homes throughout our service area — particularly older farmhouses and homes that have been added onto over the decades — have layered siding: original wood siding under a later vinyl or fiber cement re-side, sometimes with an added layer of rigid foam insulation in between. Every one of those layers changes how deep your fasteners need to reach and how you detail your flashing. If you cut into a wall and find more layers than you expected, slow down and reassess your fastener length and flashing plan before proceeding.
Masonry and Stone Veneer
If your home has brick veneer, stone veneer, or manufactured stone, understand up front that these are not acceptable ledger attachment substrates. Veneer isn’t structural and isn’t designed to carry deck loads. In these cases, the typical solution is a freestanding deck design with its own posts and footings set away from the house, avoiding a ledger connection to the veneer wall entirely. This is a case where we’d strongly encourage a design conversation before you buy a single board.
Soil and Footing Considerations
While the ledger connects to the house, the rest of your deck frame rests on footings set in native soil, and our region’s freeze-thaw cycle affects those too. Footings throughout Spokane, Stevens, and Pend Oreille counties typically need to be set below the local frost line — check with your local building department for the exact depth requirement in your area, since it varies by elevation and microclimate even within a relatively short drive.
Common Mistakes We See at the Counter
After decades of helping customers plan and build decks throughout the region, a few mistakes come up again and again:
- Fastening into siding or studs instead of exposing and bolting to the rim joist.
- Using deck screws or common nails in place of rated structural fasteners.
- Skipping flashing entirely, or installing it in the wrong order so water gets trapped behind the ledger instead of shed away from it.
- Not removing enough siding to properly integrate flashing, leaving gaps where water can sneak in at the edges.
- Hanging joists before the ledger is fully secured, which can shift the ledger out of position and compromise the whole connection.
- Using a bowed or twisted ledger board, which throws off your entire deck’s level and makes clean flashing nearly impossible.
- Ignoring lateral load requirements — many jurisdictions require lateral load connectors (hold-down devices) in addition to the ledger fasteners themselves, and skipping these is a common reason projects fail inspection.
- Assuming an old rim joist is sound without actually inspecting it once the siding is off.
DIY or Call a Professional?
A straightforward, low, single-story deck with good interior access to confirm your rim joist location and no hidden rot is a very reasonable DIY project for a homeowner comfortable with a drill, a level, and careful measuring. Materials are affordable, the process is well documented, and local building departments across the region can walk you through permit requirements.
On the other hand, bring in a professional if you’re dealing with a second-story deck, brick or stone veneer, any sign of rot or past water intrusion, limited or no interior access to verify framing, or a deck design that will carry heavy snow load or an unusually long span. Ledger failures are consistently one of the leading causes of deck collapses nationally, and the cost of getting a professional opinion is small compared to the cost of a failure — or the cost of tearing out a completed deck to fix a ledger that never should have passed inspection in the first place.
What Drives Your Project Cost
For a typical ledger installation, expect your material costs to come from pressure-treated ledger stock, self-adhered flashing membrane, metal or PVC flashing, structural fasteners (through-bolts, lag screws, or branded structural screws), and joist hangers. Costs climb quickly if siding removal reveals rot that needs repair, if the wall assembly has extra layers to work through, or if lateral load connectors and engineering review are required for your specific site and design. Simple, materials-only DIY projects tend to be the most economical route; professional installs cost more but include labor, code compliance, and inspection coordination that’s especially valuable on more complex homes.
Whether you’re planning a simple ground-level deck in Kettle Falls or a larger second-story project in the Spokane area, we stock the pressure-treated lumber, structural fasteners, flashing membranes, and joist hangers you need to do this job right — and our team at Airway Heights, Colville, and Kettle Falls can help you work through your specific wall assembly, span requirements, and fastener spec before you ever pick up a drill. Stop by one of our locations or browse what we carry online at https://bldrsupply.epicor-inet.com/departments.